in a box of stones, the ratio of red marbles to total marbles 2:5. The ratio of green stone to total stones is 3:10. If the stones that are neither red nor green is blue, how many blue stones are the box if there are 40marbles in the box?

12 blue marbles

Step-by-step explanation:

multiply 2:5 by 8 to get 16:40

multiply 3:10 by 4 to get 12:40

add 16 to 12 to get 28

Subtract 28 from 40 to get 12

Ultimately, you have 12 blue marbles

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step-by-step explanation:

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